Heading track deviation when aircraft equipment problem malfunction suspected.

Attributes
ACN	261912
Time
Date	199401
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zma
State Reference	FL
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	CV 580
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute airway : zma
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 10700 flight time type : 500
ASRS Report	261912
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical non adherence : clearance other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

On climb out from mbdv en route to mia, passing through 11000 ft, the right propeller oversped by 500 RPM, the RPM shown was close to the RPM where the propeller would pitchlock. This particular airplane had the right engine shut down due to overspd condition twice in the past 2 weeks. Both propeller regulators were replaced due to the failures. Not wanting to extend our distance over the water, figuring we may have another regulator failure, we did an immediate right turn towards provo. ATC was notified of the turn after it was initiated (about 90 degrees). The problem turned out to be a failure of the synchronization control and propeller control returned to normal with it off. ATC was then advised to cancel our priority handling and a course change was initiated to continue to miami.

Original NASA ASRS Text

Title: HDG TRACK DEV WHEN ACFT EQUIP PROB MALFUNCTION SUSPECTED.

Narrative: ON CLB OUT FROM MBDV ENRTE TO MIA, PASSING THROUGH 11000 FT, THE R PROP OVERSPED BY 500 RPM, THE RPM SHOWN WAS CLOSE TO THE RPM WHERE THE PROP WOULD PITCHLOCK. THIS PARTICULAR AIRPLANE HAD THE R ENG SHUT DOWN DUE TO OVERSPD CONDITION TWICE IN THE PAST 2 WKS. BOTH PROP REGULATORS WERE REPLACED DUE TO THE FAILURES. NOT WANTING TO EXTEND OUR DISTANCE OVER THE WATER, FIGURING WE MAY HAVE ANOTHER REGULATOR FAILURE, WE DID AN IMMEDIATE R TURN TOWARDS PROVO. ATC WAS NOTIFIED OF THE TURN AFTER IT WAS INITIATED (ABOUT 90 DEGS). THE PROB TURNED OUT TO BE A FAILURE OF THE SYNCHRONIZATION CTL AND PROP CTL RETURNED TO NORMAL WITH IT OFF. ATC WAS THEN ADVISED TO CANCEL OUR PRIORITY HANDLING AND A COURSE CHANGE WAS INITIATED TO CONTINUE TO MIAMI.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.